Apparatus for electrically making cup-shaped projections in metal plates.



T. E. MURRAY, Js. APPARATUS FOR ELECTRICALLY MAKING CUP-SHAPED PROJECTIONS IN METAL PLATES.

APPLICATION mzo MAY 5, 29'.

1,242,580. Patented 00a 9,1917

63 i" 1:1 if "7 l //1 lowing is a specification.

UNITED STATES PATENT OFFICE,

THOMAS E. MURRAY, JB., 0! BROOKLYN, NEW YORK.

APPARATUS FOR ELEGTBIGALLY MAKING CUP-SHAPED PROJECTIONS IN METAL v PLATES.

To all whom it may concern:

Beit'known that I, THOMAS E. MURRAY,

'State of ew York, have invented a certain new and useful Improvement in Apparatus for Electrically Making Cup-Shaped Projections in Metal Plates, of which the fol- The invention is an apparatus for electrically making cup-shaped projections in metal plates.

In the accompanying drawings- Fi re 1 is a plan view of the electrodes, the o ject in which the cup-shaped projection is to be formed, and the clamps for said object. Fi 2 is a vertical section showing the vertical movable former in elevation and in raise position.

Similar letters of reference indicate like parts- A andB are separated electrodes resting upon any suitable supports C, from which they are insulated. An opening D, here circular in cross section, is formed by oppositely placed semi-circular recesses in the opposing faces of said electrodes and supports. A metal plate E, in which the cupshaped projection is to be formed, is placed upon the electrodes A, B to cover the opening D, and is secured by clamping bars F and bolts, which bars are in electrical contact with said electrodes.

The former G is supported above theplate E in any suitablemanner for vertical motion. The lower portion a of said former is to be of a predetermined diameter, corresponding to the internal diameter of the des1rcd cup. In order to determine the depth of the projection or cup, a collar 6 of diameter greater than that of the part a is preferably made integral with the former G, and at a selected distance from the lower end of said former.

The operation is as follows:

The plate E heing clamped in position on the electrodes A, B, a current is established of sufiicient strength to heat and so soften Specification 01mm Patent.

Patented Oct. 9, 1917.

Application filed Kay 5 1917. Serial No. 186,582.

the portion oi said plate which covers said openin D. The former G is then caused to descen and so to force said softened metal into said opening D, until the collar b meets the clam s F, and so acts as a stop to prevent furt er descent of said former; In this way, the cup-shaped projection H is produced, and at the same time molded at its periphery between said former and said electrodes.

When the collar 6' meets the clamps F, the'current is short circuited drawn from the completed cup.

y gravity 1 The cavity, cup or recess thus produced in one side of the plate E may serve as a step to receive ashaft or rod, or vany other desired purpose: or the hollow closed projection appearing on the op osite 'side of said late D may serve as a ug or stop. The ormer and the opening D instead of being circular ma be made of any desired cross section, as, or instance, rectangular.

I claim:

An apparatus for electrically making an integral cup-shaped projection on a metal plate, comprising two separated electrodes having in their opposing faces registering transverse recesses, a longitudinally movin former adapted to enter the opening forms by said recesses for a predetermined distance to mold said projection in said opening, and means for short-circuiting the heating current, automatically operating upon the entrance of. said former into sai opening for a certain predetermined distance.

In testimony whereof I have affixedmy signature in presence of two witnesses.

THOMAS E. MURRAY, JR. Witnesses:

GERTRUDE T. PORTER, MAY T. MCLARRY. 

